Aerosol 101 VOC/MIR · Here are some examples ranked by MIR value: These MIR numbers probably...
Transcript of Aerosol 101 VOC/MIR · Here are some examples ranked by MIR value: These MIR numbers probably...
VOC Calculations
Grams per liter –Architectural/Automotive Paint
Percent by Weight
Maximum Incremental Reactivity (MIR)
“Percent by weight”“Percent by Weight VOC”means the total weight of VOC in
a product expressed as a
percentage of the product weight
(exclusive of the container or
packaging), as determined
pursuant to sections 94515 (a)
and (b).
Percent by Weight
Example
Formulation Example:
Chemical Formula % V.O.C. Total V.O.C. Water 30 No = 0 % Acetone 20 No = 0 % Xylene 10 Yes = 10 % Ethanol 20 Yes = 20 % Isobutane 20 Yes = 20 %
Total = 50 %
Reactivity
Use of individual Maximum
Incremental Reactivity
Values for a compound to
determine a MIR limit for
Aerosol Coatings.
•Reactivity is a measure of how much a compound contributes to the photochemical formation of ozone.
• EPA usually compares the reactivity's of
compounds to the reactivity of ethane to
evaluate "negligibly reactive" status.
What is
“Reactivity”all about ….
Toluene 4.00
Ethanol 1.53
Isopropyl Alcohol 0.61
Propane 0.49
EXEMPT
Acetone 0.36
Ethane 0.28
Methane 0.014
Here are some examples ranked by MIR value:
These MIR numbers probably represent worst case values and
may be different for conditions found in different cities.
Maximum Incremental
Reactivity Values…
How is a product formulation
using the new Reactivity method
be determined?
Formulation example:
Chemical Formula % MIR % x MIR
Resins/solids 20 0 = 0
Toluene 20 4.00 = 0.80
Acetone 30 0.36 = 0.11
Isopropyl 10 0.61 = 0.06
Propane 20 0.49 = 0.10
Total = 1.07
*Note: MIR values from 1/2000 Carter model
Photochemical
Reactivity Concepts
Reactivity - Measure of a VOC’s potential to react in the atmosphere and lead to the formation of ozone
Use of “lower reactive” VOCs may provide means for ozone reduction benefit where mass-based VOC reductions are not feasible
Flexible approach that gives manufacturers more reformulation options
May not be appropriate for all categoriesproducts that contain only a few percent VOCs or contain compounds with the lowest MIR values